Respiratory disease in infancy.
D000367:Age Factors; D001724:Birth Weight; D002673:Child, Hospitalized; D004739:England; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D010298:Parity; D011247:Pregnancy; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000401:mortality; D012621:Seasons; D012923:Social Class